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Implications of polymorphism in Thysanoptera

Published online by Cambridge University Press:  19 September 2011

T. N. Ananthakrishnan
T. N. Ananthakrishnan
Affiliation:
Entomology Research Institute, Loyola College, Madras 34, India
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Abstract

Functional diversities associated with structural polymorphism involving oedymery and gynaecoidy among males and major and minor forms in females, with or without alary polymorphs appear typical of many mycophagous Tubulifera. Notable is the occurrence of reproductive polymorphism resulting in oviparity, ovoviviparity, and viviparity among individuals of the same species reflecting both gross as well as histological profiles.

While alary polymorphism tends to result in ovarian diversities in some species, the combination of this feature with gynaecoidy and oedymery among Tubulifera results in a variety of mating combinations and variations in egg output. Information presented pertains to the mating patterns in mycophagous and sporophagous species in relation to the degree of polymorphism and reproductive efficiency in terms of oviposition rates. The considerably higher longevity of the oedymerous males as compared to gynaecoids adds further to the reproductive efficiency of the oedymeres. Size assortive mating is very evident, with females tending to reject males smaller than them, and with males competing for larger females in this intrasexual rivalry.

Résumé

Diversités functionelles associés avec le polymorphisme structurelle (oedymerisme et gynaecoidisme avec les mâles, “major” at “minor” femelles, et “alary” polymorphisme) paraîssent typique de beaucoup des mycophagous tubuliférès. Le polymorphisme reproducteur comprennet oviparité, ovo-viviparité, et viviparité dans les individuels de le même espèce qu'indique plus des variations dans les profiles externe et interne. Pendant l'alary polymorphisme resuite dans les diversités ovariennes avec quelques espèces, le combination de cette feature avec gynaecoidisme et oedymerisme dans les tubuliférès offert une diversité de combinations s'accouplés, et aussi les variations dans la ponte d'oeufs.

L'information presente ici appertient a les patternes d'accoupler dans les espèces “mycophagous” et “sporophagous” avec la relation à le degré de polymorphisme et l'efficacité reproducteur calculé par les proportions d'ovipositions. Le longevité est plus elevé dans les mâles “oedymerous” vers les “gynaecoi-dous”, qu'indique une meilleur efficacie reproducteur. Le facteur de dimension est important parce que les femelles rejetent les mâles qui sont plus petits, et les mâles rivalisent pour les femelles qui sont plus de grosses.

Keywords

PolymorphismoedymerygynaecoidyoviparityovoviviparityviviparityPolymorphisme oedymeriegynaecoidieoviparitéovoviviparitéviviparité
Type
Symposium II: Biotypes, Polymorphism and Co-evolution in Tropical Insects
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 4-5-6: Recent Advances in Research on Tropical Entomology , December 1987 , pp. 435 - 439
Copyright
Copyright © ICIPE 1987

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